At 05:52 PM 7/13/2001 -0400, Rob St. Amant wrote:

>Hi,
>
>I'm using common graphics (ACL 5.0 and ACL 6.0 for Windows) to do some
>user interface work, which includes drawing graphical objects and text
>strings.  The problem I'm running into is that I want to draw the text
>on a background whose color may not be known.  (The interface is to
>some legacy code for which I can't very easily figure this out.)  I've
>been using
>
>(cg:with-background-color (window <color>)
>   (cg:draw-string-in-box. . .))
>
>in other contexts, which generates a box of the given color and draws
>the string on top; of course, I don't know this color.  I'd like to
>have just the pixels of the characters drawn on the screen.  Is there
>an appropriate function I haven't run into?
>
>Thanks,
>Rob St. Amant

Take a look at the help for the function 
cg:transparent-character-background (which is setf'able).  I think that the 
following will work in your case:

   (setf (cg:transparent-character-background window) t)
   (cg:draw-string-in-box ...)

- Jeff

===================================================================
  Jeff Usher               Computer Science Department
  <ils.nwu.edu at usher>        Northwestern University
  (847) 491-7165           1890 Maple Avenue, Evanston, IL 60201, USA